參數資料
型號: P89V51RC2FN,112
廠商: NXP Semiconductors
文件頁數: 68/80頁
文件大?。?/td> 0K
描述: IC 80C51 MCU FLASH 32K 40-DIP
產品培訓模塊: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
標準包裝: 9
系列: 89V
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數: 32
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
產品目錄頁面: 706 (CN2011-ZH PDF)
配用: 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP
其它名稱: 568-2430-5
935278782112
P89V51RC2FN
PIC18F87K22 FAMILY
DS39960D-page 70
2009-2011 Microchip Technology Inc.
4.7
Ultra Low-Power Wake-up
The Ultra Low-Power Wake-up (ULPWU) on pin, RA0,
allows a slow falling voltage to generate an interrupt
without excess current consumption.
To use this feature:
1.
Charge the capacitor on RA0 by configuring the
RA0 pin to an output and setting it to ‘1’.
2.
Stop charging the capacitor by configuring RA0
as an input.
3.
Discharge the capacitor by setting the ULPEN
and ULPSINK bits in the WDTCON register.
4.
Configure Sleep mode.
5.
Enter Sleep mode.
When the voltage on RA0 drops below VIL, the device
wakes up and executes the next instruction.
This feature provides a low-power technique for
periodically waking up the device from Sleep mode.
The time-out is dependent on the discharge time of the
RC circuit on RA0.
When the ULPWU module wakes the device from
Sleep mode, the ULPLVL bit (WDTCON<5>) is set.
Software can check this bit upon wake-up to determine
the wake-up source.
See Example 4-1 for initializing the ULPWU module.
EXAMPLE 4-1:
ULTRA LOW-POWER
WAKE-UP INITIALIZATION
A series resistor, between RA0 and the external capac-
itor, provides overcurrent protection for the RA0/AN0/
ULPWU pin and enables software calibration of the
time-out (see Figure 4-9).
FIGURE 4-9:
ULTRA LOW-POWER
WAKE-UP INITIALIZATION
A timer can be used to measure the charge time and
discharge time of the capacitor. The charge time can
then be adjusted to provide the desired delay in Sleep.
This technique compensates for the affects of temper-
ature, voltage and component accuracy. The peripheral
can also be configured as a simple Programmable
Low-Voltage Detect (LVD) or temperature sensor.
//***************************
//Charge the capacitor on RA0
//***************************
TRISAbits.TRISA0 = 0;
PORTAbits.RA0 = 1;
for(i = 0; i < 10000; i++) Nop();
//*****************************
//Stop Charging the capacitor
//on RA0
//*****************************
TRISAbits.TRISA0 = 1;
//*****************************
//Enable the Ultra Low Power
//Wakeup module and allow
//capacitor discharge
//*****************************
WDTCONbits.ULPEN = 1;
WDTCONbits.ULPSINK = 1;
//For Sleep
OSCCONbits.IDLEN = 0;
//Enter Sleep Mode
//
Sleep();
//for sleep, execution will
//resume here
Note:
For more information, see AN879, “Using
the Microchip Ultra Low-Power Wake-up
Module”
(DS00879).
RA0/AN0/ULPWU
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